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At only 6.6 net carbs per serving, this may not be a Philly cheesesteak sandwich, but it’s a low-carb casserole that will fool your tastebuds.
Heat one tablespoon of olive oil in a large skillet over medium heat. Add the garlic, sliced mushrooms, sliced onions, and peppers to the skillet and cook until the vegetables are tender.
Heat the reserved oil and 1 tablespoon of butter in the same large skillet you cooked the vegetables. Over medium-high heat, cook the steak until lightly browned.